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https://drafts.fxtf.org/geometry/#DOMPoint [[ Let matrix object be the result of invoking create a DOMMatrix from the dictionary matrix. ]] The "matrix" argument is optional, but the algorithmm doesn't say what to do when the argument is not present. My guess is to set "matrix" to the identity matrix, or maybe just return the new point unmodified (which make point.matrixTransform() like a clone() method).
Per Web IDL, an omitted dictionary argument is equivalent to specifying {}. https://heycam.github.io/webidl/#es-dictionary